All output files must specify sequential or dynamic access mode and be described in FD entries in the DATA DIVISION.
If the output files (file-name-4,...) contain variable-length records, the size of the records contained in file-name-1 must not be less than the smallest record nor greater than the largest record described for the output files. If the output files contain fixed-length records, the size of the records contained in file-name-1 must not be greater than the largest record described for the output files. For more information, see the IBM COBOL Programming Guide for your platform.
At the time the MERGE statement is executed, the output files (file-name-4,...) must not be open. The output files are automatically opened, read, and closed, and if DECLARATIVE procedures are specified for these files for output operations, the files will be driven for errors if errors occur.
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